AppearanceErect slender glabrous annual 20–70 cm high.
Short non-flowering shoots with leaves in whorls of 3, lamina elliptic to ovate, 0.6–1 cm long, 1.5–2.5 mm wide; flowering shoots with erect, alternate leaves, lamina linear, 1–4 cm long, 0.5–1 mm wide.
Inflorescence few- to many-flowered, at first short and dense, elongating in fruit, up to 25 cm long; bracts 2–4 mm long; pedicels 3–6 mm long. Sepals fused only at base, 3–4 mm long. Corolla 6–9 mm long, purple-violet with whitish pubescent palate closing mouth; spur 7–9 mm long; upper lip pointed outwards with 2 narrow elongate lobes, lower lip shorter with recurved lobes.
Capsule 2-lobed with 2 globose lobes, 2.2–2.5 mm long
Some text fragments are auto parsed from Wikipedia.http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Linaria~pelisseriana